A:绿色植物的数量相对太多
B:空气中的氧气浓度越来越低
C:空气中二氧化碳的含量不断上升
D:由于环境日益恶化,很多物种逐渐死去
There is a new shopping mall(商场) near my school. It is very big. There are five floors(层) of shops and each floor is very big. There are lots of clothes shops, but only one sports shop. There are lots of restaurants(饭馆) on the top(顶部的) floor, you can eat different kinds of food from different countries(国家). I like going to see a movie. The mall is a really good place to go. It is a good place to meet friends.